UCGPMF-50 experimental device for pollutant migration in coal and rock formations

1.overview

This device is used to simulate the permeability of coal samples under triaxial and triaxial stress conditions under the combined action of in-situ stress, gas pressure, etc. of middling coal coal during underground gasification under natural conditions, and to measure the influence of stress change, temperature change, medium change, etc. on the permeability of coal and rock.

Experimental principle: By injecting pollutants and gases into the coal seam model, measuring the pressure at the nodes, and sampling and analyzing parameters such as concentration and composition, the diffusion law of pollutants in the local coal gasification process is studied.

2.Main technical parameters

（1）Work pressure

Ring pressure:50Mpa

Displacement pressure:40Mpa

Accuracy of stress testing:0.1%F•S

（2）Measurement range:0.01～10mL/min

（3）Working temperature:200℃, temperature control accuracy: ±0.5℃

（4）Electricity Source: Communication380V 50HZ

（5）Overall work Rate:6KW

（6）Core specifications: ф25×300㎜

3.Basic composition and structure of the instrument

The instrument mainly consists of an injection system, a modeling system, a measurement system, an automatic control system, and a data acquisition and processing system.

Injection system: composed of injection pump, intermediate container, and pipe valve components, it can inject various fluids into the model at a certain flow rate.

Simulation system: composed of core gripper, constant temperature box, ring pressure pump, back pressure system, etc.

Measurement system: including pressure measurement, temperature measurement, flow measurement, automatic measurement of oil and water volume, etc.

Automatic control: The computer automatically controls the flow rate of the injection pump, the ring pressure pump automatically tracks the internal pressure, and the constant temperature box heats and maintains a constant temperature.

Data collection and processing: Composed of various data collection cards, industrial computers, printers, and collection and processing software, it can timely collect parameters such as pressure, temperature, flow rate, oil-water volume, etc., and perform arithmetic processing on the data.

4.Technical specifications for the components that make up the instrument

（1）Injection pump

model:NP-KX-500-10Work pressure:60Mpa, Traffic:0.01～10mL/minThe pump can be operated manually or by a computer.

（2）Intermediate container

ZR-3Type intermediate container Volume:1000mLVoltage resistance:50Mpa, Material:1Cr18Ni9Tiquantity3Only.

Used for storing replacement media and serving as a buffer.

ZR-3Type Ha alloy intermediate container Volume:200mL/50MPa，1Only.

（3）Core clamp and sand filling model

The clamp is suitable for rock core specifications: ф25×300㎜， ф25×80㎜

Sand filling model: ф25×500㎜，32Mpa, two pressure measuring points

working pressure:50MpaRing pressure:60Mpa

texture of material:316L

（4）Environmental pressure tracking pump

DJB-80Atype working pressure:60MpaUsed to apply circumferential pressure to the core gripper and seal the core.

Manual and electric operation, equipped with communication port, can be operated by microcomputer.

（5）Thermostatic box

Working temperature:180℃±0.5℃

Size inside the studio:1200×800×850Mm (length x width x height).

Front and rear doors, interior lighting, made of stainless steel material.

Hot air circulation, usingPIDAdjust temperature control technology to achieve uniform temperature inside the box and high temperature control accuracy.

Install rolling casters for easy mobility.

After processing in two sections, they are connected as a whole for easy handling.

（6）Valves, pipelines, fittings and processes

useDW3NECKAR High pressure valve fittings, pressure resistant70Mpa.

（7）Measurement system

Pressure measurement: pressure transmitterDG1300-BZ-B-2-60/AA、DG1300-BZ-B-2-4/AA

measurement accuracy0.25%F·SUsed for pressure measurement at the inlet and outlet of rock cores and various pressure measuring points, all pressures are measured usingWP-C901-20-17-PThe pressure digital display can also be displayed through the digital displayRS232The mouth is collected by a computer.

Temperature measurement: usingPT100Temperature probe,XMT-7512ZX-RZTemperature controller setting, temperature control, and temperature measurement.

Flow measurement: using balance weighing method to calculate liquid flow rate

Balance model:BP423S, Range420g, accuracy0.001g

The computer automatically collects and calculates traffic values.

Oil water automatic measurement: using liquid level and electronic balance to automatically measure the volume of oil and water, and the volume values of oil and water are automatically collected and calculated by the oil computer.

（8）Data collection system

useMOXA C168H/PCI、MOXA C104H/PCIThe data acquisition board timely collects pressure, temperature, and flow rate.

（9）Automatic control system

Computers can automatically control the following external devices

（1）Injection pump: Through the communication interface of the pump, the computer can control the injection flow rate;

（2）Environmental pressure tracking pump: computer throughHY6160The terminal board automatically controls the opening and closing of the ring pressure pump and solenoid valve, maintaining the pressure difference between the displacement pressure and the ring pressure.

picture1 Schematic diagram of measurement and control system

（10）Application software and data processing

Software inwindows2000/XPOperating in the environment, usingVBProgramming. The workflow of the instrument is displayed on the interface, enabling human-machine dialogue. After the operator sets the parameters, unmanned operation can be achieved. The computer can automatically collect all pressures and flow rates, control the operation of the pump, and track the environmental pressure pump automatically.

The data collected by computers can be processed to generate raw data reports, analysis reports, and curve graphs, while also generating database file formats for users to use flexibly.

Computer: YangtianA8000Cprinter:HP1160

5.Main technical features

（1）The device adopts modular design and can be combined according to different experimental requirements;

（2）Capable of conducting high-temperature and high-pressure displacement tests under simulated geological conditions;

（3）Key components are imported to improve the reliability and accuracy of testing;

（4）Realize computer automation control, acquisition, and processing;

（5）Track the injection pressure of the ring pressure and maintain a constant pressure difference;

（6）The high and low range pressure transmitters can be switched to ensure the accuracy of pressure testing;

（7）The structure of the instrument is reasonable, the appearance is beautiful and elegant, the operation is convenient, and it is durable;

（8）We have a complete range of optional parts and can select models of different specifications from our factory according to different testing needs, making the instrument widely used in various experimental research fields.

6.basic operation

（1）Rock sample preparation

① Drilling and cutting of rock samples: drilling the rock sample into a diameter of φ25Or ф38The cylinder is cut flat at both ends, and the cutting surface is perpendicular to the axis.

For the method of drilling rock samples, please refer toSY/T5336

② Wash oil for rock samples

Oil washing method according toSY/T5336execute

③ Drying of rock samples

The drying temperature of the rock sample is controlled at60～65℃, drying24hAfterwards, every8hWeigh once, and the difference between the two weighings is less than10mgRecord the measured quality of the rock sample.

④ Measuring the geometric dimensions of rock samples: length（L）Diameter（D）.

⑤ Measurement of gas permeability in rock samples according toSY/T5336conduct.

⑥ Extract saturated oil (water) from the rock sample, weigh it wet, and calculate the pore volume of the rock sample.

⑦ Soak the saturated rock sample in oil (water) and set it aside.

（2）Process preparation

Ensure that the liquid in the storage container and various pumps is sufficient. If it is insufficient, please add it.

（3）Installation of rock cores

Take out the pre saturated rock core from the beaker, place it in the clamp rubber sleeve, install the clamp plug, and tighten the rock sample.

（4）Seal the rock sample with ring pressure

① Manually apply ring pressure

Turn the manual and automatic switches on the control panel to the manual position, turn on the ring pressure pump switch, and when the pressure is increased to the required value, turn off the ring pressure pump switch.

② Automatic ring pressure

Turn the manual and automatic switches on the control panel to the automatic position. In the computer experimental program, click the experiment start button, and the computer will automatically control the start and stop of the ring pressure pump, and track the displacement pressure to maintain the difference between the ring pressure and displacement pressure.

（5）Heating up

First, turn on the fan switch of the constant temperature box on the panel, then turn on the heating switch. Set the temperature to be heated on the temperature controller, and the temperature controller will automatically control the constant temperature box to reach the desired temperature.

The temperature setting method of the temperature controller is detailed in the temperature controller user manual

To stop heating, simply turn off the heating switch or set the temperature controller to below the ambient temperature.

（6）Experimental evaluation

Various experimental methods are detailed in the industry standards for experimental evaluation.

7.secure

The safe operation of the instrument involves the personal safety of the operator and the normal service life of the instrument. The manufacturer reminds the operator to pay attention to the following points:

（1）All types of instruments and computers must ensure correct power input and be equipped with automatic voltage stabilization protection devices.

（2）Ensure that all parts of the instrument have good grounding.

（3）The pressure of each part of the process manifold should not exceed the design pressure, especially not exceed the range of various detection instruments. Extra caution must be taken when using gas pressurization.

（4）The valve design of the instrument is manual operation. Please pre design the test process according to the test steps. Any valve operation error may lead to the failure of the entire test.

（5）When operating the system at high temperatures, insulated gloves must be worn to prevent burns.

8.maintenance

The constant speed pump needs to be cleaned regularly, and for detailed maintenance, please refer to the pump manual.

Electronic scales should avoid strong vibrations and must not be overloaded. For detailed precautions, please refer to the scale manual.

The computer equipped with this instrument is a dedicated control machine for the instrument. Do not copy software randomly, especially floppy disks of unknown origin. Computer viruses may cause confusion and errors in control and data acquisition.

All parts of the instrument that come into contact with liquids are made of stainless steel, which has a certain degree of corrosion resistance, but it is not a one-time solution. The process manifold needs to be cleaned regularly, especially after injecting acid or other highly corrosive liquids, it should be immediately cleaned with clean water. When the process is not in use for a long time, fill the process manifold with oil or blow dry it with high-pressure air to prevent rust and corrosion.

Long term use can cause normal damage to the process seals, affecting their sealing performance. Therefore, it is recommended to regularly conduct pressure tests on the instruments to ensure their integrity.Replace the seal for the leaked part, and for frequent users, the cycle should be3A month is appropriate.